I always clean things with a microfiber cloth and reduced alcohol lens cleaner. Then a Giottos blower to get everything all dry and clean.

I always use a blower or compressed air FIRST, to blow away any grit or dirt particles that might scratch the glass if wiped with the microfiber cloth.

George

OH! Whoops! Yeah I left that step out. First blower, then check for any remaining large particles, then microfiber+solution, then blower, final check, then be happy with a clean screen/viewfinder/lens.